Alternate funcall syntax in expressions

[Jose E. Marchesi]

Hi peoples!

Until now, the alternate funcall syntax that uses named arguments could
only be used in expression-statement contexts, i.e. this was allowed:

  gcd :a 1024 :b 8;

but not this:

  2 + (gcd :a 1024 :b 8)

I just pushed a patch that adds support for the later.  Note how using
the alternate syntax in an expression requires to surround the funcall
with parenthesis.

Salud!